Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a fragmentary enlarged front view showing the details of the tread portion thereof; and,

FIG. 7 is a section view taken along line 7-7 in FIG. 6.

In the drawings, the broken lines defining the sidewall, inner bead depict environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 